Coronal X-ray emission of late-type MS stars in relation to chromospheric activity and magnetic cycles.

Details Coronal X-ray emission of late-type MS stars in relation to chromospheric activity and magnetic cycles. Coronal X-ray emission of late-type MS stars in relation to chromospheric activity and magnetic cycles.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc...45h&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 45 - 46

Astronomy and Astrophysics

Astrophysics

Stellar Coronae: X Rays, Stellar Coronae: Stellar Activity, Stellar Chromospheres: Stellar Activity

Scientific paper

The authors study the relationship between the coronal X-ray emission of single, main-sequence F-K stars and the characteristics of their magnetic cycles. They use X-ray data primarily from the ROSAT all-sky survey as well as data acquired by them in the ROSAT pointed program, and the published data of the Mt. Wilson Ca II H+K monitoring program. According to the Ca II H+K long-term variability characteristics, the authors divide the stars into three groups: constant stars, regular variable and irregular (chaotic) variable stars. They show that the regular and the irregular stars differ mainly in their Rossby-numbers (Ro): regular stars have almost always Ro < 1 whereas the irregular group is characterised by Ro > 1; further, the X-ray surface flux distributions differ significantly between these three groups. The authors discuss to what extent stars exhibiting constant Ca II fluxes can be considered Maunder minimum stars, and demonstrate - in a statistical sense - that cyclic chromospheric activity also implies cyclic coronal activity.

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